Phonograph-reproducer.



T. A. EDISON. PHONOGRAPH REPRODUOEB..

APPLICATION FILED JUNE l1| 1908.

1,0416, 1 59. Patented Dec. 3, 1912.

y 2 SHEETS-SHEET 9.

UNITED STATES P arENT oEEIcE.

THOMAS A. EDISON, OF LL'EWELLYN PARK, ORANGE, NEW JERSEY, ASSIGNOR T0 THOMAS A. EDISON, INCORPORATED, OF WEST-ORANGE, NEW JERSEY,` A CORPORA-- TION OF NEW JERSEY.

PHONOGRAPH-REPRODUCER.

Specification of Letters Patent.

Application filed June `11, 1908. Serial No. 437,844.

Be it known that I, THOMAS A. Enisox, a' citizen of the United States, and' a resident of Llewellyn Park, Orange, 1n the county of Essex and State of New Jersey, have in-4 vented certain new and useful Improvements in Phonograph-Reproducers, of which the following is a description.

My invent-ion relates to reproducers for phonographs, and more particularly to that type which is adapted to 'operate upon a sound record in the form of a groove having elevations and depressions corresponding graphically to the original sound waves.

The object of my invention is to secure a louder and more perfect reproduction than can be obtained from the ordinary forni of reproducer, or to secure a reproduction of equal loudness with less wear upon the record.

With this end in view I employ a pair of reproducer styluses arranged oneI slightly in advance of the other, with-respect to the record groove.

' In an application for Letters Patent filed concurrently herewith, I have described andbroadly claimed a reproducer constructed on this principle, and have specifically claimed that form in which both styluses are carried by a single lever which is mounted on a single floating weight.

The present invention relates to an improved reproducer in whichthe two stylu'ses are mounted upon separate stylus levers, which are mounted preferably upon sepaf rate floating weights, pivoted so as to have independent movement, and said stylus levers may be connected either to the same point of a single diaphragm or to different parts of a single diaphragm, or they may be connected to separate diaphragms if desired. i

In order that the invention may be more fully understood, reference is made to the accompanying drawing ot which- Figure 1 is a side elevation, Apartly in section, of a reproducer constructed in accordance with my invention, and showing the two stylus levers connected to different parts of a single diaphragmg' Fig. 2 is a bottom plan view of the reproducer of Fig. 1; Fig. 3 is a similar view of'a reproducer in which the two stylus levers are connected to the center of a single diaphragm; Fig. 4 is a plan View of the diaphragm of Fig. 1, and

Fig. 5 'is a section on line 5 5 of Fig. 4.

Patented nee. 3, 1912.

said block 6. The weights 18 and 14, as

shown, lie side by side in the same general plane and on opposite sides of a plane parallel to the direction of the pivotal movement thereof. The stylus lever 18 is pivoted at '19 to a pair of lugs 20, which depend from the weight 13, and a stylus 12 is secured lin a socket formed in the end of the said'lever 18, the opposite end .of the said lever being connected by the link 21 to the diaphragm 2 at a point eccentric thereto. Ihestylus lever 22 is pivoted to the lugs 23, which depend from the floating weight 14, the axis of said lever being in the same line as that of the lever .18. One end of the lever 22 isv formed with a. socket within which is *secur'ed the stylus 11, and the other end of the lever 22 is connected by a link 24, with `the diaphragm 2 ata point eccentric and opposite to. that at which the link 21 is connected. The styluses 1J. and 12 may be of any s'uitable form adapted to track the recordand is formed with two series yot' annular corrugations 25 and 26 respectively, eyes 27 being secured at the centers of 'each of said" brate practically independently of each other. It is obvious that if desired the links 21 and 24 may be connected to a pair of separate circular diaphragrns, correspondiof ifi,

`ing to the annular members'25 and 26,' or

the diaphragm 2. may be out in tvvo along the line of the groove 28 to forni separate diaphragms. j

v The reproducer of Fig. 3 differs from that tof ligs. vl and 2 only in the fact that the *'leverslS and 22v are ot 'somewhat dier'ent 'forni and thelinlrsill and 2li are connected tothe Center of the diaphragm, which may.

be'of any desi-red form or material.

Having nowv described nay invention, what Iclainfiisz-v f y `1.A A' phonograph reproduoer comprising a sound boX body provided with a single diaphragm, a pair of lloating Weights pivf oted to the sound bonbody and lying side by side and on oppbsite sides of a plane parallel to the direction of the pivotal move- .ment thereof, and a stylus lever and-stylus .supported by each Weight, said levers being 'connected to said diaphragm and said sty-` `al sound box body and a single diaphragm,

la pair of styluses, adapted to co-act With a sound record, nieans supporting said :sty-

luses lWith the operative surfaces of the latter located in substantially thesaine plane parallel to the grooves of. the sound record When the reproduoer and record are in operative position, one vof said styluses being slightly in advance of the other, and con-` nections from said styluses to Widely separated portions of said diaphragm, substantially as set forth. I

ln a phonograph reproducer, the coinbination of a sound box body provided with a'single diaphragm having a plurality of sets of annular corrugations whose centers vare at a 'substantial distance apart, a plurality' of independent floating Weights pivoted tothe sound box body, and. a stylus lever and stylus carried by eacli-loating Weight, the stylus levers being'- respectively connected to the diaphragm at the centers antenna ent floating Weights pivoted tothe sound .box body, and a stylus lever and stylus'car- 'ried by eaclL of the floating'A Weights, the

lsty-lus levers being respectively connected to different sections of the diaphragm, substantially as set forth.

5.A phonograph reproducer comprising a body, a pair of floating Weights, a'stylus' lever supported by each Weight, and a stylus carried by each lever, said styluses adapted.

to oo-act with a sound record and 'supported with their operative surfaces located in substantially the same plane parallel to the grooves of the sound record when the reproducer and record are in operative position, one of said styluses being in advance of the other, and both being positioned to co-aot` with the record at the same time, a single diaphragm, and connections from each sty'- lus lever to said diaphragm, substantiallyas set forth.

tl. A phonograph reproducer diaphragm provided with a pluralityof sets of annular oorrngations Whose centers are at a substantial distance roin each other, substantially as set forth.

'7.- ,lt phonograph reproducer diaphragm provided with a plurality of sets of annularl corrugations Whose eenters are at a substantial distance from each other, and a groove separating said sets of oorrugations and extending transversely to a line connecting their centers, substantially as set forth,

8. A phonograph reproducer diaphragm having a dialnetric groove dividing the saine into sections adapted to vibrate substantially independently of each other, substantially as set forth.

rlhis specilication signed and witnessed this 8th day of lune 1908.

THOS. A. EDSN. l/Vitnesses:

FRANK L. Dyna,

FRANK D. Lewis. 

